Cities are my main research topic. I study them through the history of their concrete and symbolic formation. I am interested in showing that the efforts involved in the physical organization of cities shape the way they are governed and help structure social and political relationships at this level. This way of seeing the history of cities as a product of interrelated physical and social factors has led to published papers on the development of public spaces for culture and recreation in Montreal and Toronto in the 19^th and 20^th centuries, and on the structuring of the municipal domain through drinking water and wastewater networks. I recently published a paper on evolving relationships between Montreal and water, in an attempt to reconstitute the role of water and its successive transformations in the city's urbanization process since the early 19^th century. Since then I have been pursuing my work on the history of the environment at the larger scale of the Great Lakes-St. Lawrence hydrographic system.

I am also interested in issues relating to the writing and public uses of history in theoretical and practical terms. I have taken part in various debates and roundtables on the teaching of history. I also sometimes collaborate on mounting exhibitions and producing historical documents for various audiences.

My research interests concern the processes of reform and centralization in the Arab provinces of the Ottoman Empire throughout the 19^th century (Egypt, Syria, Iraq, North Africa), from a cultural and social perspective. The central role of the press and associations in the emergence of a public space during the Arab Renaissance and the issues of education and citizenship in the colonial and post-colonial periods are central to my research.

At the same time, my work bears on the symmetrical processes of professionalization and the popularization of Islamic expertise in the 20^th century. More specifically, I am interested in the institutional and curricular development of mosque-universities such as al-Azhar, Zaytuna and Qarawiyyin, from the 18^th century until their nationalization in the 1960s, and also in the legacies and uses of Islamic historiography, philosophy and law in the contemporary period, particularly in nationalism and Islamism.

My current research aims to contribute to the cultural history of Arab nationalism and to define its key institutions: volunteer associations and secret societies; scouting movements; school textbooks.